Buderus Logamax plus GB162 Technical Manual page 45

Function modules FM456 KSE2 and FM457 KSE4
In conjunction with the Logamatic 4121 and 4122 control
units, these function modules can control a cascade
comprising from two to eight Buderus gas condensing
boilers with UBA1.5 and/or UBA3.5 (EMS) (automatic
recognition).
The following functions are available:
• Fully modulating operation of all appliances
• Serial operation of two or four appliances in a cascade
• Fixed or intelligent boiler sequence changeover
• Automatic load limiting in summer mode
In each Logamatic 4122 control unit, up to two FM456
function modules for controlling four gas condensing
boilers or two FM457 function modules for controlling up
to eight gas condensing boilers can be used.
Communication-enabled MEC2 programming unit
All important parameters of the Logamatic 4121 and
4122 control units are managed by the digital MEC2
programming unit ( fig. 37). The control concept is
based on the easy and proven "Push & Turn" principle.
For this, the user prompts prevent contradictory settings
of parameters, thereby largely preventing faults during
commissioning. All available information can be displayed
in "plain text". One room temperature sensor and a radio
clock receiver are integrated as standard.
The MEC2 programming unit can be located either at the
control unit, in an online set at the boiler casing or with the
room installation set in the living space. A simple 2-core
cable connects the room installation set wall mounting
bracket with the Logamatic 4121 or 4122 control unit.
If the MEC2 programming unit with the room installation
set functions as a remote control in the living space, use
a boiler display inside the control unit in its place. In that
case, this operating display shows the system flow.
• Room installation set with wall mounting bracket and
boiler display (product no. 5 720 812)
For further details, see the technical guide
concerning the "modular Logamatic 4000
control system".
6 720 645 821 (2010/09) – Logamax plus GB162
Fig. 37 MEC2 programming unit with integral room
temperature sensor and wall mounting bracket
1 MEC2 programming unit including integral room
temperature sensor and radio clock receiver
2 Wall mounting bracket for the MEC2 programming unit
MEC2
≥ 0,6
Fig. 38 Position of the wall mounting bracket for the
MEC2 programming unit in the reference room
(dim. in mm)
1 Required clearance below the MEC2
Heating control
–
+
1
6 720 641 280-18.1il
≥ 1
1
6 720 641 280-19.1il
4
2
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